Classification of the family Megalonychidae

Fm. †Megalonychidae Gervais 1855
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G. †Amphihapalops Ameghino 1891
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Amphihapalops cadens Ameghino 1891
Amphihapalops congermanus Ameghino 1891
Amphihapalops gallaicus Ameghino 1891
G. †Amphiocnus Kraglievich 1922
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Amphiocnus paranense Kraglievich 1922
G. †Analcimorphus Ameghino 1891
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Analcimorphus giganteus Ameghino 1894
Analcimorphus inversus Ameghino 1891
Subfm. †Choloepodinae MacPhee 2001
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G. †Acratocnus Anthony 1916
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Acratocnus antillensis Matthew 1931
Acratocnus odontrigonus Anthony 1916
Acratocnus ye MacPhee et al. 2001
G. Choloepus Illiger 1811
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Choloepus andinus Allen 1913
Choloepus didactylus Linnaeus 1758 [Linnaeus's two toed sloth]
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Invalid names: Choloepus braziliensis Fitzinger 1871 [synonym], Choloepus curi Link 1795 [synonym], Choloepus didactylus columbianus Gray 1871 [synonym], Choloepus florenciae Allen 1913 [synonym], Choloepus guianensis Fitzinger 1871 [synonym], Choloepus napensis Lönnberg 1922 [synonym], Choloepus unau Link 1795 [synonym]
Choloepus hoffmanni Peters 1858 [Hoffmann's two-toed sloth]
G. †Neocnus Arredondo 1961
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Neocnus comes Miller 1929
Neocnus dousman MacPhee et al. 2001
Neocnus gliriformis Matthew 1931
Neocnus major Arredondo 1961
Neocnus toupiti MacPhee et al. 2001
G. †Paulocnus Hooijer 1962
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Paulocnus petrifactus Hooijer 1962
Invalid names: Acratocnini Varona 1974 [empty], Choloepodini Gray 1871 [empty], Cubanocnini Varona 1974 [empty]
G. †Deseadognathus Carlini and Scillato-Yané 2004
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Deseadognathus riggsi Carlini and Scillato-Yané 2004
G. †Diheterocnus Kraglievich 1928
G. †Eleutherodon Mercerat 1891
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Eleutherodon heteroclitus Mercerat 1891
G. †Eucholoeops Amegino 1887
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Eucholaeops titan Lydekker 1894
Eucholoeops fronto Ameghino 1891
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Invalid names: Eucholoeops latifrons Mercerat 1891 [synonym]
Eucholoeops ingens Ameghino 1887
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Invalid names: Eucholoeops curtus Ameghino 1894 [synonym], Eucholoeops externus Ameghino 1891 [synonym], Eucholoeops latirostris Ameghino 1891 [synonym]
Eucholoeops litoralis Ameghino 1891
Eucholoeops titans Lyddekker 1894
G. †Eugeronops Ameghino 1891
G. †Geronops Ameghino 1891
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Geronops circularis Ameghino 1891
G. †Hapalops Ameghino 1887
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Hapalops adteger Amegino 1887
Hapalops aguirrei Mercerat 1891
Hapalops angustipalatus Ameghino 1891
Hapalops antistis Ameghino 1897
Hapalops atlanticus Ameghino 1891
Hapalops australis Mercerat 1891
Hapalops boulei Mercerat 1891
Hapalops brachycephalus Ameghino 1894
Hapalops brevipalatus Ameghino 1891
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Invalid names: Stenocephalus hybridus Mercerat 1891 [synonym]
Hapalops cilindricus Ameghino 1891
Hapalops cognathus Mercerat 1891
Hapalops congermanus Ameghino 1891
Hapalops crassidens Ameghino 1891
Hapalops crassignathus Ameghino 1891
Hapalops crassissimus Ameghino 1894
Hapalops crassissimus Ameghino 1894
Hapalops curvus Ameghino 1899
Hapalops depressipalatus Ameghino 1891
Hapalops diverssidens Ameghino 1891
Hapalops elongatus Ameghino 1891
Hapalops forticulus Ameghino 1891
Hapalops gracilidens Ameghino 1891
Hapalops grandaevus Moreno and Mercerat 1891
Hapalops grandis Ameghino 1894
Hapalops hyperleptus Ameghino 1891
Hapalops indifferens Ameghino 1887
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Invalid names: Stenocephalus australis Mercerat 1891 [synonym]
Hapalops infernalis Ameghino 1887
Hapalops latus Ameghino 1894
Hapalops longiceps Scott 1903
Hapalops longipalatus Ameghino 1891
Hapalops minutus Ameghino 1891
Hapalops platycephalus Scott 1903
Hapalops ponderosus Scott 1903
Hapalops primus Ameghino 1894
Hapalops rectagulidens Ameghino 1891
Hapalops robustus Ameghino 1891
Hapalops rostratus Ameghino 1887
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Invalid names: Xyophorus simus Ameghino 1887 [synonym]
Hapalops rutimeyeri Ameghino 1891
Hapalops sectus Ameghino 1891
Hapalops subcuadratus Ameghino 1891
Hapalops testudinatus Ameghino 1891
Hapalops vulpiceps Scott 1903
Invalid names: Stenocephalus Mercerat 1891 [synonym]
G. †Holomegalonyx Scillato-Yané 1979
G. †Hyperleptus Ameghino 1891
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Hyperleptus garzonianus Ameghino 1891
Hyperleptus schissognathus Ameghino 1891
Hyperleptus sectus Ameghino 1891
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Invalid names: Tapinotherium aguirrei Mercerat 1891 [synonym]
Invalid names: Tapinotherium Mercerat 1891 [synonym]
G. †Mecorhinus Ameghino 1894
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Mecorhinus primus Ameghino 1894
Subfm. †Megalocninae
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G. †Imagocnus MacPhee and Iturralde-Vinent 1994
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Imagocnus zazae MacPhee and Iturralde-Vincent 1994
G. †Megalocnus Leidy 1868
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Megalocnus rodens Matthew and Paula Couto 1959
Megalocnus zile MacPhee et al. 2000
G. †Parocnus Miller 1929
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Parocnus browni Matthew 1931
Parocnus serus Miller 1929
Invalid names: Megalocnini Kraglievich 1923 [empty], Mesocnini Varona 1974 [empty]
Subfm. †Megalonychinae Trouessart 1904
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G. †Ahytherium Cartelle et al. 2008
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Ahytherium aureum Cartelle et al. 2008
Invalid names: Iporangabradyx Dos Santos 1991 [nomen nudum], Iporangabradyx collecti Dos Santos 1991 [nomen nudum]
G. †Australonyx De Iuliis et al. 2009
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Australonyx aquae De Iuliis et al. 2009
G. †Megalonyx Harlan 1825
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Megalonyx curvidens Matthew 1924
Megalonyx cuvieri Lund 1839
Megalonyx gigas Marsh 1874
Megalonyx jeffersonii Desmarest 1822 [Jefferson's ground sloth]
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Invalid names: Ereptodon priscus Leidy 1853 [synonym], Megalonyx brachycephalus Sellards 1941 [synonym], Megalonyx californicus Stock 1913 [synonym], Megalonyx dissimilis Leidy 1855 [synonym], Megalonyx hogani Stovall 1940 [synonym], Megalonyx laqueatus Harlan 1831 [synonym], Megalonyx milleri Lyon 1938 [synonym], Megalonyx sierrensis Sinclair 1905 [synonym]
Megalonyx leidyi Lindahl 1892
Megalonyx leptostomus Cope 1893
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Invalid names: Megalonyx rohrmani Gustafson 1978 [synonym]
Megalonyx mathisi Hirschfeld and Webb 1968
Megalonyx obtusidens Webb and Perrigo 1985
Megalonyx validus Leidy 1868
Megalonyx wheatleyi Cope 1871
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Invalid names: Megalonyx loxodon Cope 1871 [synonym], Megalonyx scalper Cope 1899 [synonym], Megalonyx sphenodon Cope 1871 [synonym], Megalonyx tortulus Cope 1871 [synonym]
Invalid names: Megalonyx gracilis Lund 1893 [nomen nudum], Morotherium Marsh 1874 [synonym]
G. †Megistonyx McDonald et al. 2013
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Megistonyx oreobios McDonald et al. 2013
G. †Pliometanastes Hirschfeld and Webb 1968
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Pliometanastes protistus Hirschfeld and Webb 1968
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Invalid names: Pliometanastes galushai Hirschfeld and Webb 1968 [synonym]
G. †Megalonychops Kraglievich 1927
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Megalonychops primigenius Kraglievich 1926
G. †Megalonychotherium Scott 1904
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G. †Meizonyx Webb and Perrigo 1985
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Meizonyx salvadorensis Webb and Perrigo 1985
G. †Mesocnus Matthew 1931
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Mesocnus torrei Matthew 1931
G. †Mesopotamocnus Brandoni 2014
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Subfm. †Metopotherinae Ameghino 1902
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G. †Hapaloides Ameghino 1902
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Hapaloides ignavus Ameghino 1902
Hapaloides laeviusculus Ameghino 1902
Hapaloides ponderosus Ameghino 1902
G. †Proschismotherium Ameghino 1902
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Proschismotherium oppositum Ameghino 1902
Subfm. †Metopotherini Ameghino 1894
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G. †Adiastemus Ameghino 1894
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Adiastemus compressidens Ameghino 1894
G. †Metopotherium Ameghino 1891
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Metopotherium splendens Ameghino 1891
G. †Uranokyrtus Ameghino 1894
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Uranokyrtus bombifrons Ameghino 1894
G. †Microcnus Matthew 1931
G. †Miocnus Matthew 1931
G. †Nohochichak McDonald et al. 2017
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Nohochichak xibalbahkah McDonald et al. 2017
G. †Nothropus Burmeister 1882
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Nothropus carcaranensis Bordas 1942
Nothropus nordenskioldi Pujos et al. 2007
Nothropus priscus Burmeister 1882
Subfm. †Ocnopodinae Hoffstetter 1954
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G. †Ocnopus Reinhardt 1875
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Ocnopus gracilis Lund 1840
Subfm. †Ortotheriinae Ameghino 1889
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G. †Menilaus Ameghino 1891
G. †Ortotherium Ameghino 1885
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Ortotherium berroi Kraglievich 1932
Ortotherium laticurvatum Ameghino 1885
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Invalid names: Amphiocnus seneum Ameghino 1891 [synonym], Amphiocnus seneus Ameghino 1891 [synonym], Menilaus affinis Ameghino 1891 [synonym], Ortotherium schlosseri Ameghino 1891 [synonym], Ortotherium scrofum Bordas 1941 [synonym]
Ortotherium robustum Ameghino 1881
G. †Paranabradys Scillato-Yané 1980
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Paranabradys vucetichae Scillato-Yané 1980
G. †Paraplanops Ameghino 1891
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Paraplanops oblongus Ameghino 1891
G. †Pattersonocnus Rincón et al. 2019
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Pattersonocnus diazgameroi Rincón et al. 2019
G. †Pliomorphus Ameghino 1885
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Pliomorphus mutilatus Ameghino 1885
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Invalid names: Pliomorphus ameghinoi Kraglievich 1923 [synonym], Pliomorphus brevis Kraglievich 1923 [synonym]
Pliomorphus robustus Ameghino 1885
G. †Protomegalonyx Kraglievich 1925
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Protomegalonyx chasicoensis Scillato-Yané 1977
Protomegalonyx doellojuradoi Kraglievich 1925
Protomegalonyx praecursor Kraglievich 1925
G. †Pseudhapalops Ameghino 1891
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Pseudhapalops altiramis Ameghino 1894
Pseudhapalops forticulus Ameghino 1891
Pseudhapalops grandis Ameghino 1894
Pseudhapalops infernalis Ameghino 1887
Pseudhapalops observationis Ameghino 1891
G. †Pseudortotherium Scillato-Yane 1981
G. †Torcellia Kraglievich 1923
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Torcellia paranense Kraglievich 1923
G. †Trematherium Ameghino 1887
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Trematherium nanum Ameghino 1891
G. †Urumacocnus Rincón et al. 2019
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Urumacocnus urbanii Rincón et al. 2019
G. †Xibalbaonyx Stinnesbeck et al. 2017
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Xibalbaonyx exinferis Stinnesbeck et al. 2020
Xibalbaonyx microcaninus Stinnesbeck et al. 2018
Xibalbaonyx oviceps Stinnesbeck et al. 2017
G. †Zacatzontli McDonald and Carranza-Castañeda 2017
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Zacatzontli cotobrusensis Valerio et al. 2022
Zacatzontli tecolotlanensis McDonald and Carranza-Castañeda 2017
Invalid names: Choloepidae Gray 1871 [synonym]